If you looking for some deep probes into astronomy studies and discussions, then you may want to visit the Centauri Dreams site. The site’s focus is about the possibility of interstellar travel at some point in the future.
Tech writer Paul Gilster has this to say about his website:
Alpha Centauri and other nearby stars seem impossible destinations not just for manned missions but even for robotic probes like Cassini or Galileo. Nonetheless, serious work on propulsion, communications, long-life electronics and spacecraft autonomy continues at NASA, ESA and many other venues, some in academia, some in private industry. The goal of reaching the stars is a distant one and the work remains low-key, but fascinating ideas continue to emerge. This site will track current research. I’ll also throw in the occasional musing about the literary and cultural implications of interstellar flight. Ultimately, the challenge may be as much philosophical as technological: to reassert the value of the long haul in a time of jittery short-term thinking.
Mr. Gilster has a way of walking you through some dense scientific papers that makes them come alive, in part by bringing in additional information and insights to make it all relatable (that is, as much as possible).
Some of his recent articles include:
—Close Stellar Encounters and Earth’s Orbit: The essay notes the continual changes of stars in our neighborhood over time, including one that may venture close enough to enter our solar system’s Oort Cloud:
Stars do indeed get that close, as the example of Gliese 710 shows. If we’re patient, we can wait out the 1.3 million years it is projected for this to happen, for this star, on the borderline between M-dwarf and K-class, is headed our way from its current vantage in the constellation Serpens Cauda. As it will eventually be well inside the Oort Cloud, we can imagine quite an impact on cometary orbits and planetary ones as well over the long haul, as the paper I’m about to discuss shows.
—To the Stars with Human Crews?: The essay discusses the potential role of solar sails in space travel, the ideas of both NASA’s Les Johnson and American physicist and science fiction writer Robert L. Forward, and various science fiction stories trying to envision such sails connecting humans with other planetary systems.
—Alone in the Cosmos?: The essay discusses Louis Friedman’s new book Alone But Not Lonely: Exploring for Extraterrestrial Life, pulling apart various points for greater discussion.
In discussing the likelihood of finding intelligent life elsewhere, Mr. Gilster states:
The point is simply to cast something as evidently evanescent as our human culture against the inexorable backdrop of geological time. And to contrast even that with a galaxy that is over 13 billion years old, where processes like these presumably occurred in multitudes of stellar systems. What are the odds that, if intelligence is rare, two civilizations would emerge at the same time and live long enough to become aware of each other?
These are just a few of the many interesting articles that you can find on the site. Just roll through the collection of essays and I am sure you find plenty to capture your imagination for some time to come.
Our Awesome Universe 